Transposed Paternò−Büchi reaction

The transposed Paternò−Büchi reaction involves a ππ* excited state of alkene reacting with a ground state carbonyl functionality.

This is reversal of the traditional Paternò−Büchi reaction where an excited carbonyl group reacts with a ground state alkene.

This strategy was first reported by Sivaguru and co-workers with reaction of enamides.

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